I've shot different double barrels, and all of them had a double trigger configuration. I bought a Stoeger dble barrel supreme, single trigger, 20" barrel, etc. I put a modified choke in the left and full choke in the right side.
Ok... well, I got to finally shoot it yesterday. WOW. I did find out that a hard pull on the single trigger will let both barrels go at the same time. I asked about this and everyone told me it wouldn't. IT WILL !!
However, I shot approximately 40 yard targets. I was impressed at the accuracy and tightness of the patterns at that distance with these chokes. I'm going to love shooting clay with it, as well as hunting, but for my .02 cents.... it would also be one wicked defensive weapon.